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This addresses a side effect of crrev.com/c/1934836, that stretches all
children. Default gravity for linear layout positioned items always on
top.

Bug: 1030722
Change-Id: I1a981be06feb2126c04f36aa7306b64beb68de9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950856Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Ender <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#721568}